Wednesday, 24 June 2015

Identifying Species

When we do redox reactions, sometimes it is difficult/uncertain which species have been produced. We have other chemical tests to help us confirm which species (ions/molecules) are present. We do not need to write equations for these in the assessment for this topic, but they are worth knowing anyway...

One species not mentioned here is copper (II), Cu2+:

Adding NaOH:
Cu2+ + 2OH- --> Cu(OH)2
This is a blue precipitate.

Adding excess NH3 solution:
Cu2+ + 4NH3 <--> [Cu(NH3)4]2+
This is a royal blue solution.

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